Bag with extensile sealed liner



Jam 3 195@ E. B. HOPPE fiAG WITH EXTENSILE SEALED LINER Filed Sept. 21, 1944 ITS-'5 IIE-4L- 1 a 5 a a 4 1 1 1 1 1 1 W l NN W v 5 1 1 Z q 1 a 01 z 5 11 1 MN 4111M @3 m/pye/m Patented Jan. 3,1950 I 2,493,348 Q 2,493,341; BAG WITH lnr'r msma small 1mm nun-annuals York, N.Y.,allgnorto St. Regislaper pony, New York, N. Y.,a corporation of New ork Application September 1, 1944, Serial No. 555,089

1Claim.( 229-55) This invention relates to a bagel. paper or I4 and ii, the liner readily stretches so that the I the like closed by a sewed or stapled seam and 1 stress of the contents is transmitted chiefly to provided with a liner which is sealed below the the outer plies. seam, said sealing constituting .part of an expan- For simplicity, reference has been made to the sible lining for the bag. 5 lining of thermoplastic material, but it will 'be The object of the invention is to provide a understood that thermoplasticity is necessary paper bagwith a hermetically sealed liner so only where the seal is made, and the rest of the constructed that the stress of the contents is inner ply may be of uncoated paper or of paper taken up by the outer ply or plies without undue coated or treated in any suitable way to serve as stress on the sealed inner ply. More specifically, an aeceptable container for the material to be the object is to provide a sewed or stapled bag Packaged therein. with a heat-seal of thermoplastic material in- In the fornr shown in the drawings, the sheet side of the seam with provision for taking up the I! may be of any stretchable material suitable major part of the stress by the seam rather than for contact with the intended contents of the by the seal. 3 l5 bag,.wit enough thermoplastic material to make Sewing or stapling a bag of paper or the like the seal i2. causes perforations which allow ingress or egress Because of the extenslle characteristic required of fluids or line dust. If a lining lsprovided and of the lining which is sealed, it is somewhat difsealed along and below the seam, the contents flcult to form a bag of the kind described on a will. press initially against the seal and tend to tuber oi the kind into which there are fed long break the seal before the stress is taken up by sheets of material that are folded and sealed as the seam. The primary purpose of this invention they progress longitudinally. It is considered is to provide such a seal with provision for transpreferable to sever sheets of the size to form mitting the major part of the stress exerted by the several plies, superpose them, and then fold the contents to the seam. as them into tubes, adhering their edges to form a Details and minor objects of the invention will multiply tube. appear as the description proceeds. Altemative embodiments of the invention and In the accompanying drawings forming a part other methods for making bags according to the of this disclosure, Fig. 1 is a perspective view invention are disclosed and claimed in applicant's partially broken away showing the top portion 80 divisional application Serial No. 713,274, flled of a filled bag embodying'one form of the inven- November 30, 1946. tion, and Fig. 2 is a sectional view taken sub- It will be readily understood that the invenstantially along the line 2-2 of Fig. 1. tion may be applied readily to valve bags, open- In the drawings, there is shown a closure for mouthed bags, gusseted or ungusseted bags, and a bag comprising a binding tape i0 folded over 85 stapled as well as sewed bags. Various other the end of a bag, a seam ll sewed through the variations may be made within the scope of the tape and bag walls, and a hermetic seal l2 inside appended'claim.

of the seam. What I claim is:

The seal i2 may be formed by any suitable A multi-ply bag, the outer ply or plies of which adhesive which is impervious under the condiit are formed f r, substantially non-stretching tions to which it is to be subjected. The sealing i rmal e of the bag and enveloping a liner mat a may be applied t a imp rv u liner ply of fluid-impervious susbtantially stretchable just before the sewing or p ing, but preferably material, the plies all having a line of perforait is formed by heat-sealing an impervious therti ns along an end of the bag, and stitching means p fic liner. U y this lining is Stretchextending through said perforations to retain the able, and without any great rength. The opposed bag walls at said end in, closed upstandstrength is provided by outer layers, in this ining condition, the opposed wall suriace areas of Stance in sh wn as W l yers, It and Nigel the liner ply, at least along a band just inside paper or the like. In this construction, the lin said line of perforations, being formed of thermoi it is free to stretch without elongation of plastic material and being adhered and sealed layers It and i5, that is, the latter layers will together along said band, said liner ply being be 'susbt ntially no -stretc a in normal use sufiiciently stretchable longitudinally of the bag of e T e although the formation of as compared with an outer ply or plies, when the seal i2 somewhat shortens the bag formed by the bag is filled and expanded adjacent said end, liner layer with respect to bags formed by layers to compensate for the relative shortening of the 3 liner ply due to such sealing inside the stitching means. and whereby the stress applied to the liner ply when filled and sealed will be largely transmitted to an outer ply or plies and to said stitching means to thus relieve the adhered sealed areas of substantial stress.

EDGAR B. HOPPE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,723,255 Rowe Aug. 6, 1929 1,752,292 Bates et al Apr. 1, 1930 Number Number Certificate of Correction Patent No. 2,493,348 January 3, 1950 EDGAR B. HOPPE It is hereby certified that error appears in the above numbered patent requiring correction as follows:

V In the drawing, the present sheet should be canceled and the sheet as shown below, onta1ning Figures 1 and 2, should be substituted therefor, as part of the Letters atent- Jih- 3. z B pp; m IH'H IXTDISILB sum um flied 80M. 21. 19

and that the said Letters Patent should be read with this correction therein that the same nay conform to the record of the case in the Patent Oflice.

Signed and sealed this 14th day of February, A. D. 1950.

THOMAS F. MURPHY,

Assistant Oommz'asioner of Patents. 

